Pushbutton interface EVR

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Alban Gaines
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1 Pushbutton Interface EVR GENERAL DESCRIPTION The NJU7394 is a pushbutton interface electronic volume. It includes a electronic volume controller with differential input, attenuator function, some indicator and a stand-by function (Power-saving mode). The NJU7394 has also built-in push button interface for its volume / controls and power ON/OFF controls - making application possible without the use of micro-controller. The NJU7394 is suitable for low power application and also for application without micro-controller such as mobile audio player and cradle speaker for mobile game. PACKAGE OUTLINE NJU7394VC3 FEATURES Operating Voltage Low operating current Pop-noise reduction Quasi-differential input Pushbutton interface EVR Adjustable initial Volume +2.7 to +5.5V 2mA typ. (Active mode) 1µA typ. (stand-by mode) +6 to -62dB, MUTE -6dB, -10dB, -14dB, -18dB Attenuator / Soft MUTE Function -10dB, -15dB, -20dB, MUTE CMOS Technology Package Outline SSOP20-C3 BLOCK DIAGRAM Power Button Power indicator Volume indicator Power Bias Standby STBY SWMODE PWSW Power Contrel Logic PWIND VOLIND IREF Bias VREF GND Input L Output L Input G Electric Volume (+6dB to -62dB, Mute) Attenuator Bypass/Att. (-10dB, -15dB, -20dB, Mute) Input R Output R Volume Control Logic ATTADJ VOLADJ ATT TEST Attenuate level adjuster -10,-15,-20dB,Mute R ATT R INIT Initial volume adjuster -6,-10,-14,-18 db Up Down Test mode Attenuator NJU7394 Ver.3.3 _E - 1 -

2 PIN CONFIGURATION No. Symbol Function No Symbol Function 1 INL Lch Input 11 VOLIND Volume Indicator 2 ING Common Input 12 PWIND Power Indicator 3 INR Rch Input 13 VOLADJ Initial Volume Adjustor 4 SWMODE Control Mode Setting 14 ATTADJ Attenuator Adjustor 5 STBY Standby Setting 15 V+ Power Supply 6 ATT Attenuator Setting 16 GND Ground 7 PWSW Power Switch 17 IREF Reference Current 8 Volume Up Switch 18 OUTR Rch Output 9 Volume Down Switch 19 VREF Reference Voltage 10 TEST Test Terminal 20 OUTL Lch Output - 2 -

3 ABSOLUTE MAXIMUM RATING (Ta=25 C) PARAMETER SYMBOL RATING UNIT Power Supply Voltage +7 V Power Dissipation P D 540* 1) mw Maximum Input Voltage V IMAX 0 to * 2) V Operating Temperature Range Topr -40 to +85 Storage Temperature Range Tstg -40 to +125 * 1) EIA/JEDEC STANDARD Test board (76.2x114.3x1.6mm, 2layer, FR-4) mounting * 2) Don t apply the input voltage that exceeds supply voltage. o C o C ELECTRICAL RECOMMENDED OPERATING CONDITION (Ta=25 C) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Operating Voltage V ELECTRICAL CHARACTERISTICS DC CHARACTERISTICS (Ta=25 C, =3.3V, unless otherwise specified) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Operating Current I DD1 No Signal, Active ma I DD2 No Signal, Standby* 3) µa Reference Voltage V REF No signal V * 3) In case of the voltage of each terminal SWMODE, STBY, ATT, PWSW,, and TEST is L =0V. AC CHARACTERISTICS (Ta=25 C, =3.3V, V IN =500mVrms, f=1khz, ATT: OFF, VOL: 6dB, unless otherwise specified) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Maximum Input Voltage V IM THD=1% BW=400Hz-30kHz mvrms Output Noise Voltage 1 V NO1 Rg=0Ω, A-weighted (10) -94 (20) dbv (µvrms) Output Noise Voltage 2 V NO2 Rg=0Ω, A-weighted VOL=-62dB (10) -94 (20) dbv (µvrms) Total Harmonic Distortion THD+N V IN =250mVrms BW=400Hz-30kHz % Maximum Gain G VMAX db Initial Volume 1 G VINIT1 Power-on state R INIT =0Ω db Initial Volume 2 G VINIT2 Power-on state R INIT =47kΩ db Initial Volume 3 G VINIT3 Power-on state R INIT =100kΩ db Initial Volume 4 G VINIT4 Power-on state R INIT =OPEN db Maximum Attenuate level G V-62 VOL=-62dB BW=400Hz-30kHz db Mute Level Mute VOL=MUTE BW=400Hz-30kHz db - 3 -

4 PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT ATT Level 1 G VATT1 ATT:ON R ATT =0Ω db ATT Level 2 G VATT2 ATT:ON R ATT =47kΩ db ATT Level 3 G VATT3 ATT:ON R ATT =100kΩ db ATT Mute Level G VATT4 ATT:ON, R ATT =OPEN BW=400Hz-30kHz db Channel Balance G CB db Channel Separation CS Rg=0Ω BW=400Hz-30kHz db Indicator Output Block (Ta=25 C, =3.3V, unless otherwise specified) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Output Voltage V OH I SOURCE =1mA (pin 11, pin 12) *0.8 - V Low Output Voltage V OL I SINK =1mA (pin 11, pin 12) 0 - *0.2 V Control Block (Ta=25 C, =3.3V, unless otherwise specified) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Input Voltage V IH pin4, pin5, pin6, pin7, pin8, pin9 *0.8 - V Low Input Voltage V IL pin4, pin5, pin6, pin7, pin8, pin9 0 - *0.2 V Pull-Up Resistance R PULL kω Mode Resistance range 1/4 R MODE1 pin 13, pin kω Mode Resistance range 2/4 R MODE2 pin 13, pin kω Mode Resistance range 3/4 R MODE3 pin 13, pin kω Mode Resistance range 4/4 R MODE4 pin 13, pin kω Pulse Distinction Time ms Auto Increment Distinction Time S Auto Increment cycle ms - 4 -

5 TERMINAL DESCRIPTION PIN NO. SYMBOL EQUIVALENT CIRCUIT V+ V+ TERMINAL DC VOLTAGE 1 3 INL INR Lch Input Rch Input 52.5Ω 100kΩ 10pF /2 10pF V+ V+ 52.5Ω 1kΩ 2 ING Common Input /2 500kΩ 10pF VREF 10pF V+ V+ V SWMODE STBY ATT Control Mode Setting Standby Setting Attenuator Setting 52.5Ω It depends on a mode setting. V+ V+ V+ 7 PWSW Power Switch 8 9 Volume Up Switch Volume Down Switch 52.5Ω 0V 10 TEST Test Terminal 100kΩ - 5 -

6 PIN NO. SYMBOL EQUIVALENT CIRCUIT V+ V+ TERMINAL DC VOLTAGE VOLIND PWIND Volume Indicator Power Indicator 52.5Ω It depends on a mode setting. V+ V+ V+ V+ 12µA VOLADJ ATTADJ Initial Volume Adjustor Attenuator Adjustor 52.5Ω It depends on a mode setting. 15 V+ Power Supply 16 GND Ground 0V - 6 -

7 PIN NO. SYMBOL EQUIVALENT CIRCUIT V+ V+ V+ V+ TERMINAL DC VOLTAGE 17 IREF Reference Current 1.2V 5kΩ 5kΩ V+ V+ V+ 18 OUTR Rch Output 52.5Ω /2 20 OUTL Lch Output /2 V+ V+ V+ V+ 200kΩ 20kΩ 19 VREF Reference Voltage /2 52.5Ω 200kΩ 20kΩ - 7 -

8 PIN DESCRIPTION SWMODE (pin 4) L H PWSW: Momentary SW mode. PWSW: Toggle SW mode. Momentary SW mode data format Mode Change [ ex. ON ] Mode Change [ ex. OFF ] Mode Change [ ex. ON ] Low Toggle SW mode data format Mode Change [ ex. ON ] Mode Change [ ex. OFF ] Mode Change [ ex. ON ] Low STBY (pin 5) Toggle SW Mode L H When SWMODE and PWSW are Low, IC becomes a standby mode. When PWSW is, IC becomes active mode. * The Momentary SW mode does not support. ATT (pin 6) Toggle SW Mode L H PWSW (pin 7) Attenuator: OFF Attenuator: ON * The Momentary SW mode does not support. Momentary SW mode setting OPEN(L) H System status is changed to active mode and standby mode alternately. H OPEN(L) No change. Toggle SW mode setting H Active mode OPEN(L) Standby Mode

9 (pin 8) Momentary SW mode setting OPEN(L) H Volume setting is increased 1 step. Long push increase volume setting continuously. H OPEN(L) No change. * The Toggle SW mode does not support. (pin 9) Momentary SW mode setting OPEN(L) H Volume setting is decreased 1 step. Long push decrease volume setting continuously. H OPEN(L) No change. * The Toggle SW mode does not support. TEST (pin 10) L H Normal operation mode Test mode. Do not use for normal operation. VOLADJ (pin 13) CONNECTED RESISTANCE 0Ω to 20kΩ 40Ω to 60kΩ 90kΩ to 110kΩ 150kΩ to OPEN Volume initial value: -6dB Volume initial value: -10dB Volume initial value: -14dB Volume initial value: -18dB ATTADJ (pin 14) CONNECTED RESISTANCE 0Ω to 20kΩ 40Ω to 60kΩ 90kΩ to 110kΩ 150kΩ to OPEN Attenuator initial value: -10dB Attenuator initial value: -15dB Attenuator initial value: -20dB Mute - 9 -

10 CONTROL DATA INITIAL CONDITION (POWER ON) TERMINAL CONDITION Power Pin 7 Standby Volume Pin 8, Pin 9-6dB, -10dB, -14dB, -18dB Volume gain step setting Step No. Volume [db] 0 MUTE (*) (*) (*) (*) (*) Initial Setting

11 TIMING CHART (Momentary SW mode) Standby release (Standby mode Active mode) PWSW (pin7) Low or OPEN 20ms PWIND (pin12) Low 280ms 40ms Output (pin18, pin20) /2 0V Standby (Active mode Standby mode) PWSW (pin7) PWIND (pin12) Low or OPEN Low 20ms 40ms 280ms Output (pin18, pin20) /2 0V

12 TIMING CHART (Toggle SW mode) Standby release (Standby mode Active mode) PWSW (pin7) Low or OPEN 20ms PWIND (pin12) Low 280ms 40ms Output (pin18, pin20) /2 0V Standby (Active mode Standby mode) PWSW (pin7) PWIND (pin12) Low or OPEN Low 20ms 40ms 280ms Output (pin18, pin20) /2 0V

13 TIMING CHART (Volume / control) 1. Recognition condition of Volume / push button I/F 1-a.) The Volume /() recognizes the data-command to the case that the () button has not been pushed, besides that the () button is pushed for the longer time than the Pulse Distinction Time: 20ms". 1-b.) The Volume /() recognizes the data-command to the case that the () button has pushed earlier than the () button, besides the () button is pushed for the longer time than the Pulse Distinction Time: 20ms". > Pulse Distinction Time (20ms typ.) Recognition > Pulse Distinction Time (20ms typ.) Recognition 1-a 1-b 2. Invalidity condition of Volume / push button I/F 2-a.) The Volume /() does NOT recognize the data-command to the case that the () button has pushed for the shorter time than the Pulse Distinction Time: 20ms". (The Chattering prevention function operates.) 2-b.) The Volume /() does NOT recognize the data-command to the case that the () button has pushed for the shorter time than the Pulse Distinction Time: 20ms" after released button. (The Chattering prevention function operates.) 2-c.) The Volume /() does NOT recognize the data-command to the case that the () button has pushed before releasing () button. < Pulse Distinction Time (20ms typ.) < Pulse Distinction Time (20ms typ.) 2-a 2-b 2-c

14 TIMING CHART (Volume / control) 3. Start condition of Volume / Auto increment function 3-a.) The Auto increment of volume () is started to the case that the () button has not been pushed, besides that the () button is pushed for the longer time than the Auto increment Distinction Time: 1s". > Auto increment Distinction Time (1s typ.) Auto increment starts 3-a 4. Stop condition of Volume / Auto increment function 4-a.) The Auto increment of volume () is stopped to the case that the () button has released for the longer time than the Pulse Distinction Time: 20ms" for the Auto increment period. 4-b.) The Auto increment of volume () is stopped to the case that the () button has pushed for the Auto increment period. Auto increment Distinction Time (1s typ.) Increment start Pulse Distinction Time (20ms typ.) Auto increment Distinction Time (1s typ.) Increment start Increment stop Increment stop 4-a 4-b

15 APPLICATION CIRCUIT 1µF 100kΩ 1µF OUTL OUTR Output L Output R R ATT R INIT VREF IREF GND V+ ATTADJ VOLADJ PWIND Input L INL ING INR SWMODE STBY ATT PWSW TEST VOLIND NJU µF 1µF Input G Input R 0.47µF [CAUTION] The specifications on this databook are only given for information, without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights

NJU keys input key-scan IC GENERAL DESCRIPTION PACKAGE OUTLINE FEATURES BLOCK DIAGRAM PIN CONFIGURATION

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